This messages started for me on 03-15-18 after a Windows Autoupdate. All access to the webcam was all the time blocked in windows security option. I had to use Kaspersky to be able to block webcam access. Now it keeps spamming me daily with messages.
Please do NOT remove the block-webcam-access option.
Microsoft obviously lies about that: For statistics about a webcam it does not need to be activated! If they would want statistics they would use a .log textfile! Activating the webcam to get knowledge about its usage only works if you also look through it!
Is there a kaspersky-option to block the build-in microphone?